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EA341
Generator Automatic Voltage Regulator
Operation Manual
Self Excited Automatic Voltage Regulator
Compatible with Newage MX341*
* Use for reference purpose only and not a genuine Newage product.
Headquarters : No.3, Lane 201, Chien Fu ST., Chyan Jenn Dist., Kaohsiung, TAIWAN
Tel : + 886-7-8121771
Fax : + 886-7-8121775
URL : http://www.kutai.com.tw
1. SPECIFICATION
Sensing Input
Voltage
Frequency
190 ~ 264 VAC Max, 1 phase, 2 wire
50 / 60 Hz, selectable
Power Input (PMG)
Voltage
170 ~ 220 VAC Max, 3 phase 3 wire
Current
3A / Phase
Frequency
100 ~ 120 Hz, nominal
Output
Voltage
Current
Resistance
Max. 120 VDC
Continuous 2.7A
Intermittent 6A for 10 sec
Min. 15 ohm
Voltage Regulation
< ± 1% ( with 4% engine governing )
Voltage Build-up
Residual voltage at AVR terminal > 5 VAC
Thermal Drift
0.05% per °C change in AVR ambient
External Volt Adjustment
± 10% with 1K ohm 1 watt trimmer
Unit Power Dissipation
Max. 12 watt
Under Frequency Protection (Factory Setting)
Set point 95% Hz
Slope 170% down to 30 Hz
Current Limit Input
10 ohms burden
Sensitivity range
Soft Start Ramp Time
3 sec.
Analogue Input
Max. Input
Sensitivity
Input Resistance
± 5 VDC
1V for 5% generator volt
1K ohm
Droop Input
Burden
Max. sensitivity
Max. input
10 ohm
0.07 A for 5% droop (PF=0)
0.33 A
Over Voltage Detector Input
Set point 300V. Time delay 1 Sec (fixed)
CB trip coil volt
10 ~ 30 VDC / 0.5 Amp
CB trip coil resistance 20 ~ 60 ohms
Over Excitation Protection
Set point
90 VDC
Time delay
10 sec (fixed)
Typical System Response
AVR response 10 ms
Filed current to 90% 80 ms
Machine Volt to 97% 300 ms
Environmental
100Hz ~ 2K Hz 3.3g
Relative Humidity 0 ~ 70 °C 95% (see note 6)
Operating temperature -40 to +70 °C
Storage temperature -40 to +85 °C
Weight
394g ± 2%
0.5 ~ 1A
2. GENERAL DESCRIPTION
terminals. Sustained generator short circuit current
is another feature of the PMG system.
● EA341 is a two phase sensed Automatic Voltage
Regulator and forms part of the excitation system
for a brush-less generator. Excitation power is
derived from a three-phase permanent magnet
generator (PMG), to isolate the AVR control circuits
from the effects of nonlinear loads and to reduce
radio frequency interference on the generator
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● The AVR senses the voltage in the main
generator winding and controls the power fed to
the exciter stator and hence the main rotor to
maintain the generator output voltage within the
specified limits, compensating for load, speed,
temperature and power factor of the generator.
● Soft start circuitry is included to provide a smooth
controlled build up of generator output voltage.
● A frequency measuring circuit continually
monitors the shaft speed of the generator and
provides under-speed protection of the excitation
system by reducing the generator output voltage
proportionally with speed below a pre-settable
threshold. A further enhancement of this feature
is an adjustable VOLT per Hertz slope to improve
engine recovery time on turbo charged engines.
Soft start circuitry is included to provide a smooth
controlled build up of generator output voltage.
● Uncontrolled excitation is limited to a safe period
by internal shutdown of the AVR output device.
This condition remains latched until the generator
has stopped.
● Provision is made for the connection of a remote
voltage trimmer, allowing the user fine control of
the generator’s output.
● An analogue input is provided allowing
connection to a controller or other external
devices with compatible output.
● The AVR has the facility for droop CT connection,
to allow parallel running with other similarly
equipped generators.
NOTE :
1. Derate linearly from 3.7A at 50 °C to 2.7A at 70 °C.
2. The stated voltage regulation may not be
maintained in the presence of certain transmitted
radio signals. Any change in regulation will fall
within the limits in Criteria B of S.EN.61000-6-2 :
2001.
3. After 10 minutes.
4. Applies to Mod status E onwards. Generator
de-rate may apply. Check with factory. Factory
set, semi-sealed, jumper selectable.
5. Any device connected to the analogue input must
be fully looting (galvanically isolated from
ground), with an insulation strength of 500Vac.
6. Non condensing.
3. SUMMARY OF AVR CONTROLS
CONTROL
VOLT
STABILITY
UFRO
DROOP
TRIM
EXC
DIP
FUNCTION
To adjust generator output voltage
To prevent voltage hunting
To set the UFRO knee point
To set the generator droop to 5% at 0pf
To optimize analogue input sensitivity
To set the over excitation cut off level
To set the frequency related voltage dip
DIRECTION
Clockwise increases output voltage
Clockwise increase the damping effect
Clockwise reduces the knee point frequency
Clockwise increases the droop
Clockwise increases the gain or sensitivity
Clockwise increase the cut off level
Clockwise increases the voltage dip
4. ADJUSTMENT OF AVR CONTROLS
4.1 Voltage Adjustment
The generator output voltage is set at the factory,
but can be altered by careful adjustment of the
VOLT control on the AVR board, or by the external
hand trimmer if fitted.
Terminals 1 and 2 on the AVR will be fitted with a
shorting link if no hand trimmer is required.
WARNING
Do not increase the voltage above the rated
generator voltage. If in doubt, refer to the
rating plate mounted on the generator case.
Do not ground any of the hand trimmer
terminals, as these could be above earth
potential. Failure to observe this could cause
equipment damage.
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EA341
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If a replacement AVR has been fitted or re-setting of
the VOLT adjustment is required, proceed as
follows :
1. Before running generator, turn the VOLT control
fully anti-clockwise.
2. Turn remote VOLT trimmer (if fitted) to midway
position.
3. Turn STABILITY control to midway position.
4. Connect a suitable voltmeter (0~300V ac) across
line to neutral of the generator.
5. Start generator set, and run on no load at
nominal frequency e.g. 50~53Hz or 60~63Hz.
6. If the red Light Emitting Diode (LED) is
illuminated, refer to the Under Frequency Roll Off
(UFRO) adjustment.
7. Carefully turn VOLT control clockwise until rated
voltage is reached.
8. If instability is present at rated voltage, refer to
stability adjustment, then re-adjust voltage if
necessary.
9. Voltage adjustment is now completed.
4.2 Stability Adjustment
● The AVR includes stability or damping circuit to
provide good steady state and transient
performance of the generator.
● A jumper link selector is provided to optimize the
response of the stability circuit to various size
generators.
● The link should be positioned as shown in the
diagram according to the kW rating of the
generator. The correct setting of the Stability
adjustment can be found by running the
generator at no load and slowly turning the
stability control anti-clockwise until the generator
voltage starts to become unstable. The optimum
or critically damped position is slightly clockwise
from this point (i.e. where the machine VOLT are
stable but close to the unstable region).
4.3 Under
Frequency
Roll
Off
The UFRO adjustment is preset and sealed and
only requires the selection of 50 or 60Hz and 4 pole
or 6 pole, using the jumper link as shown in the
diagram. For optimum setting, the LED should
illuminate as the frequency falls just below nominal,
i.e. 47Hz on a 50Hz system or 57Hz on a 60Hz
system.
4.4 DROOP Adjustment
Generators intended for parallel operation are fitted
with a quadrature droop C.T. which provides a
power factor dependent signal for the AVR. The C.T.
is connected to S1, S2 on the AVR, (see generator
wiring diagram for details). The DROOP adjustment
is normally preset in the works to give 5% voltage
droop at full load zero power factors. Clockwise
increases the amount of C.T. signal injected into the
AVR and increases the droop with lagging power
factor (cos Ø). With the control fully anti-clockwise
there is no droop.
4.5 Trim Adjustment
● An analogue input (A1 A2) is provided to connect
to the controller or other devices. It is designed to
accept dc signals up to ±5 VOLT.
● The dc signal applied to this input adds to the
AVR sensing circuit. A1 is connected to the AVR
0 VOLT. Positive on A2 increases excitation.
Negative on A2 decreases excitation.
● The TRIM control allows the user to adjust the
sensitivity of the input. With TRIM fully
anti-clockwise the externally applied signal has
no effect. Clockwise it has maximum effect.
● Normal setting is fully clockwise when used with
a controller.
WARNING
Any devices connected to this input must be
fully floating and galvanically isolated from
ground, with an insulation capability of 500V
ac. Failure to observe this could result in
equipment damage.
(UFRO)
Adjustment
The AVR incorporates an under-speed protection
circuit which gives a VOLT / Hz characteristic when
the generator speed falls below a presentable
threshold known as the “knee” point. The red Light
Emitting Diode (LED) gives indication that the
UFRO circuit is operating.
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4.6 Er Excitation (EXC) Adjustment
4.7 DIP Adjustment
This adjustment is set and sealed in the works and
should not be tampered with. An over excitation
condition is indicated by the illumination of the red
LED which also indicates under-speed running and
over-volt.
This feature is mostly used when the generator is
coupled to turbo charged engines with limited block
load acceptance. The feature works by increasing
the V/Hz slope to give greater voltage roll off in
proportion to speed.
The generator must be stopped to reset an
over-excitation trip.
With the DIP control fully anti-clockwise, the
generator voltage will follow the normal V/Hz line as
the speed falls below nominal. Turning the DIP
control clockwise provides greater voltage roll off
aiding engine recovery.
5. FITTING AND OPERATING (Refer to generator wiring diagram for connection
details)
TRIM
High Temperature
DROOP
VOLT
EXC. TRIP
DIP
C-A < 90KW
C-B 90-550KW
B-A > 550KW
LED
UFRO
Figure 1
STABILITY
C B A
Outline Drawing
UNIT : mm
ATTENTION
1. AVR can be mounted directly on the engine, genset, switchgear, control panel, or any position that will
not affects operation. For dimension reference, please see Figure 1.
2. All voltage readings are to be taken with an average-reading voltmeter Meggers and high-potential test
equipment must not be used. Use of such equipment could damage the AVR.
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EA341
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k1-k2 linked for
normal operation.
K2
K1
P2
P3
P4
XX
X
3
2 2 1
TRIM
A1
A2
S1
S2
SENSING SELECTION
High Temperature
DROOP
1
2
3
4
5
6
7
8
VOLT
EA341
EXC. TRIP
DIP
FREQUENCY
SELECTION
SELECTION
UFRO
STABILITY
3 2 1
INDICATOR
LED
Exciter
3-1
3-2
2-1
NO
C B A
4P/60HZ
4P/50HZ
6P/50HZ
LINK 6P/50HZ
Generator
3Ø Bridge
Figure 2
勵勵勵
Exciter
PMG
C-B 90KW~550KW
B-A OVER 550KW
3Ø整整整
Bridge
Disposition Drawing
220V
主主主主主
Generator
R
G
~
S
C.T
T
外外外整
1KΩ
1Kexternal
歐歐 adjusted
For
P2 P3 P4
XX
X
2
1
2
3
S1
S2
EA341
Figure 3 Wiring Drawing
Note : When the system voltage over 220VAC, a transformer is necessary at
sensing input terminal is recommend.
※ Use only original supplied spare protection fuse for fuse replacement.
※ Please accept our sincere apology if any modification in performance, specification or appearance is
made without prior notice.
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EA341